Slimes still spawn, but only within 15 blocks above bedrock (adminium) and in large cavernous areas. If you dig down really far, and find a nice big area within 15 blocks of the bottom, you might find slimes. Another thing about slimes, is they spawn on any difficulty, including peaceful, but only the small one's will spawn on peaceful. There's a glitch where big slimes don't de-spawn when you change the difficulty.
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Yes. Slimes are considered hostile mobs, and therefore will not spawn on Peaceful. Switching to Normal or Hard will give you a higher chance of finding one, but Easy still works. Keep in mind, though, that Slimes only spawn on level 40 (40 blocks above Bedrock) or below, and only in around 10% of the chunks. So good luck. Also, Slimes spawn regardless of the lighting, so lighting an area will indirectly increase the chances of getting a slime by reducing other hostile mob spawns. Hope this helped.
there are magma cubes but no slimes.
slimes spawn only on slime chunks
You can find slimes in flat areas at lease 6-7 blocks wide. Or in slime dungeons.
The only way to spawn herobrine in minecraft is to use mods as you cannot spawn him in vanilla minecraft.